Anatomy

1. The tendency of a stretched muscle fiber to return to its original length is called ______.
2. One motor nerve fiber and all the muscle fibers innervated by it are called a _________ _______.
3. A plasma membrane is said to be ______________ if there is a difference in charge on opposite sides of it.
4. The ____________ ___________ theory is the current model of how a muscle fiber contracts.
5. A resting muscle is normally in a state of partial contraction called _________________.
6. A muscl…

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In a resting muscle, the __________ contains a concentrated solution of calcium.